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/*******************************************************************************
*
* Module Name: utxfmutex - external AML mutex access functions
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2012, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#define __UTXFMUTEX_C__
#include "acpi.h"
#include "accommon.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME ("utxfmutex")
/* Local prototypes */
static ACPI_STATUS
AcpiUtGetMutexObject (
ACPI_HANDLE Handle,
ACPI_STRING Pathname,
ACPI_OPERAND_OBJECT **RetObj);
/*******************************************************************************
*
* FUNCTION: AcpiUtGetMutexObject
*
* PARAMETERS: Handle - Mutex or prefix handle (optional)
* Pathname - Mutex pathname (optional)
* RetObj - Where the mutex object is returned
*
* RETURN: Status
*
* DESCRIPTION: Get an AML mutex object. The mutex node is pointed to by
* Handle:Pathname. Either Handle or Pathname can be NULL, but
* not both.
*
******************************************************************************/
static ACPI_STATUS
AcpiUtGetMutexObject (
ACPI_HANDLE Handle,
ACPI_STRING Pathname,
ACPI_OPERAND_OBJECT **RetObj)
{
ACPI_NAMESPACE_NODE *MutexNode;
ACPI_OPERAND_OBJECT *MutexObj;
ACPI_STATUS Status;
/* Parameter validation */
if (!RetObj || (!Handle && !Pathname))
{
return (AE_BAD_PARAMETER);
}
/* Get a the namespace node for the mutex */
MutexNode = Handle;
if (Pathname != NULL)
{
Status = AcpiGetHandle (Handle, Pathname,
ACPI_CAST_PTR (ACPI_HANDLE, &MutexNode));
if (ACPI_FAILURE (Status))
{
return (Status);
}
}
/* Ensure that we actually have a Mutex object */
if (!MutexNode ||
(MutexNode->Type != ACPI_TYPE_MUTEX))
{
return (AE_TYPE);
}
/* Get the low-level mutex object */
MutexObj = AcpiNsGetAttachedObject (MutexNode);
if (!MutexObj)
{
return (AE_NULL_OBJECT);
}
*RetObj = MutexObj;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiAcquireMutex
*
* PARAMETERS: Handle - Mutex or prefix handle (optional)
* Pathname - Mutex pathname (optional)
* Timeout - Max time to wait for the lock (millisec)
*
* RETURN: Status
*
* DESCRIPTION: Acquire an AML mutex. This is a device driver interface to
* AML mutex objects, and allows for transaction locking between
* drivers and AML code. The mutex node is pointed to by
* Handle:Pathname. Either Handle or Pathname can be NULL, but
* not both.
*
******************************************************************************/
ACPI_STATUS
AcpiAcquireMutex (
ACPI_HANDLE Handle,
ACPI_STRING Pathname,
UINT16 Timeout)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *MutexObj;
/* Get the low-level mutex associated with Handle:Pathname */
Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
if (ACPI_FAILURE (Status))
{
return (Status);
}
/* Acquire the OS mutex */
Status = AcpiOsAcquireMutex (MutexObj->Mutex.OsMutex, Timeout);
return (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiReleaseMutex
*
* PARAMETERS: Handle - Mutex or prefix handle (optional)
* Pathname - Mutex pathname (optional)
*
* RETURN: Status
*
* DESCRIPTION: Release an AML mutex. This is a device driver interface to
* AML mutex objects, and allows for transaction locking between
* drivers and AML code. The mutex node is pointed to by
* Handle:Pathname. Either Handle or Pathname can be NULL, but
* not both.
*
******************************************************************************/
ACPI_STATUS
AcpiReleaseMutex (
ACPI_HANDLE Handle,
ACPI_STRING Pathname)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT *MutexObj;
/* Get the low-level mutex associated with Handle:Pathname */
Status = AcpiUtGetMutexObject (Handle, Pathname, &MutexObj);
if (ACPI_FAILURE (Status))
{
return (Status);
}
/* Release the OS mutex */
AcpiOsReleaseMutex (MutexObj->Mutex.OsMutex);
return (AE_OK);
}
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